i got it now, the coefficients aren't constant. the coefficient for the rectanglular flow is cd=0.611 +h/z. so i can get the mass. and for the triangular weir cd is 0.58. but because my results are wrong. i can't sub these values into the equation to get the original flow, then the mass.
Homework Statement
ok i have a problem, i did a experiment to find the weir flow. Using q= cd 2/3 b root (2g) x h^(3/2)
I measured b the width of the weir and the height. i was asked to find out the discharge coefficient cd. what i did was add weight to an unknow mass. so the original...
I'm not sure if this is right but, when the light is absorbed by an air molecule, the air moleclue emits light (photons) in the at right angles to the direction of the light beam therefore in the direction of the electric field. This will cause the light to be either vertically or hoziontally...
ah i see. so if the energy hf is greater and smaller then e= hc/wavelength then nothing happens, but if it equals to the difference between two energy levels, then the electron can "jump" to the next energy level (not always the next depending on the energy it recieves, then when it falls back...
So to work out the energy of the light i use e=hf
then i can find the energy needed for an electron to jump up to the next energy level, which will emit an photon, so if the energy of the light is greater than the energy required for the electron to jump to the energy level, then it will emit...
For example when the gas in the air absorbs light of a specific wavelength if emits light, in the direction of the electric field. why does this happen? what is the relationship between the wavelength of the light and the size of the gas molecule, for this to occur?